Constant temperature sorption hygrometer
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United States of America Patent
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Dec 27, 1988
Grant Date -
N/A
app pub date -
Jun 2, 1987
filing date -
Jun 2, 1987
priority date (Note) -
Expired
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Abstract
A constant temperature sorption hygrometer comprising a differential pair of substrate-supported heated metal film sensing elements, one coated with a hygroscopic layer of microporous aluminum oxide and the other coated with a non-hygroscopic protective coating or uncoated, both operated by feedback controlled constant temperature bridge circuits; together with alternate forms of hygrometer transducer apparatus employing differential sorption detection of water vapor.
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